This is the job of a OBLS or Open Bench Logic Sniffer. With the logic sniffer you just connect two lines to the two signals and ground to ground then you can see the data and/or run protocol tests.

I would try UART on one of the signal lines at ~4800 or perhaps use the BP v4 AutoBAUD detection to find out if its uart. I know with alot of little rf;s like that; there is +,-,Digtal (UART),analog (iuno).

well wait, one should be antenna right?

but those are hobbiest rf's. i dont know about this one.. my best advice is a OBLS.